You should have done both, I did. However, I got chewed out by my wrestling coach when I came in right before districts my sophmore year with a broken toe from sparring in karate class. One thing that works for me when in side mount is to use the bump to get the underhook. When you start to dig(pummel) for the underhook and he tries to block bump. Right when you start to come back down to the mat from the bump you should have enough space to get it. Once you get it then immediately start to turn in and/or bump again to escape.
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Dulaney Dojo